G4DecayKineticTracks.cc

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//
// Utility class to process contents of G4KineticTrackVector (input to
// models' ::Propagate() interface) and decay any short-lived resonances.
// Resulting daughters are added to vector (no function or return needed).
//
// Author:  Michael Kelsey <kelsey@slac.stanford.edu>
 
#include "G4DecayKineticTracks.hh"
#include "G4KineticTrackVector.hh"
#include "G4KineticTrack.hh"
 
 
// Decay all input tracks, put daughters onto end of list
 
G4DecayKineticTracks::G4DecayKineticTracks(G4KineticTrackVector *tracks) {
 
  if (tracks) Decay(tracks);
}
 
void G4DecayKineticTracks::Decay(G4KineticTrackVector *tracks) const {
 
  if (!tracks) return;
 
  G4KineticTrackVector* daughters = 0;
  for (size_t i=0; i<tracks->size(); ++i) {
    G4KineticTrack* track = (*tracks)[i];
    if (!track) continue;
 
    // Select decay of current track, put daughters at end of vector
    daughters = track->GetDefinition()->IsShortLived() ? track->Decay() : 0;
  
    if (daughters) {
      // Use the integer round mass in keV to get an unique ID for the parent resonance
      G4int uniqueID = static_cast< G4int >( round( track->Get4Momentum().mag() / CLHEP::keV ) );
 
      // Assign to the daughters the creator model ID of their parent
      for (size_t k=0; k<daughters->size(); ++k) {
    G4KineticTrack* aDaughter = (*daughters)[k];
    if (aDaughter) {
          aDaughter->SetCreatorModelID(track->GetCreatorModelID());
          aDaughter->SetParentResonanceDef(track->GetDefinition());
          aDaughter->SetParentResonanceID(uniqueID);          
        }
      }
      
      tracks->insert(tracks->end(), daughters->begin(), daughters->end());
      delete track;     // Remove parent track
      delete daughters;
      (*tracks)[i] = nullptr;   // Flag parent's slot for removal
    }
  }
 
  // Find and remove null pointers created by decays above
  for (G4int j=(G4int)tracks->size()-1; j>=0; --j) {
    if (nullptr == (*tracks)[j]) tracks->erase(tracks->begin()+j);
  }
}